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INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss and tax credit carryforwards $ 37,899 $ 37,440
Stock based compensation 648 502
Investment in affiliates 264 482
Deferred Revenue - Advance payment 0 64
Other 14 213
Depreciation and amortization 37 0
Deferred tax assets gross 38,862 38,701
Less - valuation allowance (38,780) (38,601)
Net deferred tax assets 82 100
Deferred tax liabilities:    
Depreciation and amortization 0 (55)
Goodwill amortization (103) (56)
Net deferred tax liabilities (103) (111)
Net deferred tax assets (liabilities) $ (21) $ (11)